TW202042935A - Optical layered body - Google Patents

Optical layered body Download PDF

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Publication number
TW202042935A
TW202042935A TW109105842A TW109105842A TW202042935A TW 202042935 A TW202042935 A TW 202042935A TW 109105842 A TW109105842 A TW 109105842A TW 109105842 A TW109105842 A TW 109105842A TW 202042935 A TW202042935 A TW 202042935A
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Taiwan
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adhesive layer
film
glass film
less
resin film
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TW109105842A
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Chinese (zh)
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稲垣淳一
村重毅
菅野敏広
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日商日東電工股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10458—Polarization selective transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Provided is an optical layered body in which optical defects are not prone to occur when the optical layered body is used in a display or other optical device. A layered body (101) is provided with a flexible glass film (10) having a thickness of 150 [mu]m or less and a resin film (20) affixed on the glass film via an adhesive layer (50). The number of foreign bodies 100 [mu]m or larger in the adhesive layer is preferably no more than 10/m2. When foreign bodies protrude from the surface of the adhesive layer (50), the height or inclination angle of protrusions is preferably small.

Description

光學積層體Optical laminate

本發明係關於一種積層可撓性玻璃膜與樹脂膜而成之光學積層體。The present invention relates to an optical laminate formed by laminating a flexible glass film and a resin film.

顯示裝置、照明裝置、太陽電池等光器件之輕量化、薄型化進展。為了滿足該等要求，亦進行自玻璃材料向塑膠材料之替換，但塑膠材料難以實現如玻璃之較高耐衝擊性及光澤性(眩光感)。Lightweight and thinning of optical devices such as display devices, lighting devices, and solar cells are progressing. In order to meet these requirements, the replacement from glass materials to plastic materials is also carried out, but it is difficult for plastic materials to achieve higher impact resistance and gloss (glare) such as glass.

對此，為了活用玻璃之優點，並且謀求器件之輕量化及薄型化，而提出使用具有可撓性之薄玻璃膜。於專利文獻1中，提出一種經由接著劑層貼合玻璃膜與偏光板而成之光學積層體。使用具有可撓性之玻璃膜之光學積層體亦能夠應用於卷對卷製程，因此除器件之薄型化及輕量化以外，亦可期待提高器件或其構成構件之生產性或低成本化。 [先前技術文獻] [專利文獻]In response to this, in order to make use of the advantages of glass and to reduce the weight and thickness of devices, it is proposed to use a thin glass film with flexibility. Patent Document 1 proposes an optical laminate in which a glass film and a polarizing plate are bonded via an adhesive layer. Optical laminates using flexible glass films can also be applied to roll-to-roll processes. Therefore, in addition to thinning and weight reduction of devices, it is also expected to improve the productivity or cost reduction of devices or their components. [Prior Technical Literature] [Patent Literature]

[專利文獻1]日本專利特開2017-24177號公報[Patent Document 1] Japanese Patent Laid-Open No. 2017-24177

[發明所欲解決之問題][The problem to be solved by the invention]

使用玻璃膜之光學積層體於實驗室等級下得到實用化，但未達到利用卷對卷製程之量產品之實用化，量產上之課題並未明確。本發明人等藉由卷對卷製程製作上述專利文獻1中所記載之光學積層體，應用於顯示裝置，結果判明存在大量光學缺陷。Optical laminates using glass films have been put into practical use at the laboratory level, but have not reached the practical use of volume products using the roll-to-roll process, and the mass production issues are not clear. The inventors of the present invention produced the optical laminate described in Patent Document 1 by a roll-to-roll process and applied it to a display device. As a result, it was found that a large number of optical defects exist.

鑒於上述情況，本發明之目的在於提供一種光學缺陷較少之光學積層體。 [解決問題之技術手段]In view of the foregoing, the object of the present invention is to provide an optical laminate with fewer optical defects. [Technical means to solve the problem]

本發明之光學積層體具備厚度150 μm以下之具有可撓性之玻璃膜、及經由接著劑層貼合於玻璃膜之第一主面上之樹脂膜。光學積層體亦可包含偏光元件作為樹脂膜。The optical laminate of the present invention includes a flexible glass film having a thickness of 150 μm or less, and a resin film bonded to the first main surface of the glass film via an adhesive layer. The optical layered body may include a polarizing element as a resin film.

於光學積層體之一形態中，接著劑層中之100 μm以上之異物之數量為10個/m2 以下。接著劑層中之5 μm以上且未達100 μm之異物之數量較佳為1300個/m2 以下。In one form of the optical layered body, the number of foreign matter larger than 100 μm in the adhesive layer is 10 pieces/m 2 or less. The number of foreign matter of 5 μm or more and less than 100 μm in the adhesive layer is preferably 1300/m 2 or less.

接著劑層中之異物較佳為與接著劑層之折射率差較小。接著劑層中之100 μm以上之異物中，與接著劑層之折射率差超過0.02之異物之數量較佳為5個/m2 以下。The foreign matter in the adhesive layer preferably has a smaller refractive index difference with the adhesive layer. In the adhesive layer, the number of foreign matter of 100 μm or more, the number of foreign matter whose refractive index difference with the adhesive layer exceeds 0.02 is preferably 5/m 2 or less.

於光學積層體之其他形態中，較佳為於樹脂膜之表面因接著劑層中之異物而形成之凸部之高度及/或傾斜角較小。為了減小樹脂膜表面之凸部之高度及/或傾斜角，較佳為於接著劑層之樹脂膜側表面突出之異物之突出高度及突出部之傾斜角較小。In other forms of the optical laminate, it is preferable that the height and/or the inclination angle of the convex portion formed on the surface of the resin film due to the foreign matter in the adhesive layer be small. In order to reduce the height and/or the inclination angle of the protrusions on the resin film surface, it is preferable that the protrusion height and the inclination angle of the protrusions of the foreign matter protruding from the resin film side surface of the adhesive layer be small.

接著劑層之樹脂膜側表面之突出部高度為7 μm以上之異物的數量較佳為10個/m2 以下。更佳為接著劑層之樹脂膜側表面之突出部高度為5 μm以上之異物的數量為10個/m2 以下。The number of foreign objects whose height of the protrusions on the resin film side surface of the adhesive layer is 7 μm or more is preferably 10 pieces/m 2 or less. It is more preferable that the number of the foreign matter whose height of the protrusion on the resin film side surface of the adhesive layer is 5 μm or more is 10 pieces/m 2 or less.

接著劑層之樹脂膜側表面之突出部傾斜角為10°以上之異物的數量較佳為10個/m2 以下。更佳為接著劑層之樹脂膜側表面之突出部傾斜角為3°以上之異物的數量為10個/m2 以下。The number of foreign matter whose inclination angle of the protrusion on the resin film side surface of the adhesive layer is 10° or more is preferably 10 pieces/m 2 or less. It is more preferable that the number of foreign matter whose inclination angle of the protrusion on the resin film side surface of the adhesive layer is 3° or more is 10 pieces/m 2 or less.

接著劑層之樹脂膜側表面之突出部高度為7 μm以上或傾斜角為10°以上之異物的數量較佳為10個/m2 以下。更佳為接著劑層之樹脂膜側表面之突出部高度為5 μm以上或傾斜角為3°以上之異物的數量為10個/m2 以下。 [發明之效果]The number of foreign objects whose protrusion height is 7 μm or more or the inclination angle is 10° or more on the resin film side surface of the adhesive layer is preferably 10 pieces/m 2 or less. It is more preferable that the number of the protrusions on the resin film side surface of the adhesive layer with a height of 5 μm or more or a tilt angle of 3° or more is 10 pieces/m 2 or less. [Effects of Invention]

本發明之光學積層體之玻璃膜與樹脂膜之間之異物缺陷較少。因此，光學缺陷較少，於用於形成光器件等時，可實現較高之良率。The optical laminate of the present invention has fewer foreign body defects between the glass film and the resin film. Therefore, there are fewer optical defects, and higher yields can be achieved when used to form optical devices.

本發明之光學積層體於玻璃膜之一面具備樹脂膜。玻璃膜與樹脂膜係經由接著劑層而貼合。The optical laminate of the present invention includes a resin film on one surface of the glass film. The glass film and the resin film are bonded via the adhesive layer.

圖1係表示光學積層體之積層構成例之剖視圖，於玻璃膜10之一面(第一主面)經由接著劑層50貼合有透明樹脂膜20，於透明樹脂膜20貼合有偏光元件30。透明樹脂膜20及偏光元件30皆相當於樹脂膜。圖1所示之光學積層體101於偏光元件30上具備黏著劑層80，於黏著劑層80之表面暫時黏有隔離件91。於玻璃膜10之另一面(第二主面)暫時黏有表面保護膜92。1 is a cross-sectional view showing an example of the laminated structure of an optical laminate. A transparent resin film 20 is bonded to one surface (first main surface) of a glass film 10 via an adhesive layer 50, and a polarizing element 30 is bonded to the transparent resin film 20 . Both the transparent resin film 20 and the polarizing element 30 correspond to resin films. The optical laminate 101 shown in FIG. 1 is provided with an adhesive layer 80 on the polarizing element 30, and a spacer 91 is temporarily adhered to the surface of the adhesive layer 80. A surface protection film 92 is temporarily adhered to the other surface (the second main surface) of the glass film 10.

＜玻璃膜＞ 玻璃膜10為具有可撓性之片狀玻璃材料。作為構成玻璃膜10之玻璃材料，可列舉：鈉鈣玻璃、硼酸玻璃、鋁矽酸玻璃、石英玻璃等。玻璃材料之鹼金屬成分(例如Na2 O、K2 O、Li2 O)之含量較佳為15重量%以下，更佳為10重量%以下。<Glass film> The glass film 10 is a sheet-shaped glass material having flexibility. Examples of the glass material constituting the glass film 10 include soda lime glass, boric acid glass, aluminosilicate glass, and quartz glass. The content of the alkali metal components (for example, Na 2 O, K 2 O, and Li 2 O) of the glass material is preferably 15% by weight or less, more preferably 10% by weight or less.

為了具有可撓性，玻璃膜10之厚度較佳為150 μm以下，更佳為120 μm以下，進而較佳為100 μm以下。為了具有強度，玻璃膜之厚度較佳為10 μm以上，更佳為25 μm以上，進而較佳為40 μm以上，尤佳為50 μm以上。玻璃膜之波長550 nm下之透光率較佳為85%以上，更佳為90%以上。玻璃膜10之密度與一般玻璃材料同樣地為2.3～3 g/cm3 左右。In order to have flexibility, the thickness of the glass film 10 is preferably 150 μm or less, more preferably 120 μm or less, and still more preferably 100 μm or less. In order to have strength, the thickness of the glass film is preferably 10 μm or more, more preferably 25 μm or more, still more preferably 40 μm or more, and particularly preferably 50 μm or more. The light transmittance of the glass film at a wavelength of 550 nm is preferably 85% or more, more preferably 90% or more. The density of the glass film 10 is about 2.3 to 3 g/cm 3 like general glass materials.

玻璃膜10之形成方法並無特別限定，可採用任意之適當方法。例如，使包含二氧化矽或氧化鋁等主原料、芒硝或氧化銻等消泡劑、及碳等還原劑之混合物於1400～1600℃之溫度下熔融，成形為片狀後進行冷卻，藉此製作玻璃膜。作為將玻璃成形為片狀之方法，可列舉：流孔下引法、熔融法、浮式法等。The method of forming the glass film 10 is not particularly limited, and any appropriate method can be adopted. For example, a mixture containing main raw materials such as silica or alumina, defoaming agents such as Glauber's salt or antimony oxide, and reducing agents such as carbon is melted at a temperature of 1400 to 1600°C, formed into a sheet, and then cooled, thereby Make glass film. As a method of forming the glass into a sheet shape, a laundering method, a melting method, a float method, etc. can be cited.

玻璃膜10可為單片，亦可為長條狀。就能夠應用於卷對卷製程，提高器件或其構成構件(例如下述光學積層體)之生產性之觀點而言，玻璃膜較佳為長條狀。玻璃膜由於具有可撓性，故而將長條狀玻璃膜以卷狀捲繞體之形式提供。長條狀玻璃膜之長度較佳為100 m以上，更佳為300 m以上，進而較佳為500 m以上。長條狀玻璃膜之寬度例如為50～3000 mm，較佳為100～2000 mm。The glass film 10 may be a single piece or a long strip. From the viewpoint of being applicable to a roll-to-roll process and improving the productivity of a device or its constituent members (for example, the optical laminate described below), the glass film is preferably elongated. Due to the flexibility of the glass film, the long glass film is provided in the form of a roll. The length of the long glass film is preferably 100 m or more, more preferably 300 m or more, and still more preferably 500 m or more. The width of the long glass film is, for example, 50-3000 mm, preferably 100-2000 mm.

作為玻璃膜10，亦可使用市售之薄玻璃。作為市售之薄玻璃，可列舉康寧公司製造之「7059」、「1737」或「EAGLE2000」、旭硝子公司製造之「AN100」、NH TECHNO GLASS公司製造之「NA-35」、日本電氣硝子公司製造之「OA-10」、SCHOTT公司製造之「D263」或「AF45」等。As the glass film 10, commercially available thin glass can also be used. Examples of commercially available thin glass include "7059", "1737" or "EAGLE2000" manufactured by Corning, "AN100" manufactured by Asahi Glass Co., Ltd., "NA-35" manufactured by NH TECHNO GLASS, and Nippon Electric Glass Co., Ltd. "OA-10", "D263" or "AF45" manufactured by SCHOTT.

＜樹脂膜＞ 於玻璃膜10之一主面經由接著劑層50設置有樹脂膜。於圖1所示之光學積層體101中，設置有透明樹脂膜20作為樹脂膜，於其上設置有偏光元件30。藉由於玻璃膜10與偏光元件30之間配置透明樹脂膜20，有偏光元件30之耐久性提高之傾向。又，藉由於玻璃膜10與偏光元件30之間配置透明樹脂膜20，有對於來自玻璃膜10之表面之衝擊之耐久性提高之傾向。＜Resin film＞ A resin film is provided on one main surface of the glass film 10 via an adhesive layer 50. In the optical laminate 101 shown in FIG. 1, a transparent resin film 20 is provided as a resin film, and a polarizing element 30 is provided thereon. Since the transparent resin film 20 is arranged between the glass film 10 and the polarizing element 30, the durability of the polarizing element 30 tends to be improved. In addition, since the transparent resin film 20 is arranged between the glass film 10 and the polarizing element 30, the durability against the impact from the surface of the glass film 10 tends to be improved.

透明樹脂膜20之材料並無特別限定。就對偏光元件賦予耐久性、或提高光學積層體之耐衝擊性等觀點而言，作為透明樹脂膜之材料，可較佳地使用透明性、機械強度、熱穩定性及水分阻斷性等優異之熱塑性樹脂。作為此種樹脂材料之具體例，可列舉：三乙醯纖維素等纖維素樹脂、聚酯樹脂、聚醚碸樹脂、聚碸樹脂、聚碳酸酯樹脂、聚醯胺樹脂、聚醯亞胺樹脂、聚烯烴樹脂、(甲基)丙烯酸樹脂、環狀聚烯烴樹脂(降𦯉烯系樹脂)、聚芳酯樹脂、聚苯乙烯樹脂、聚乙烯醇樹脂、及該等之混合物。The material of the transparent resin film 20 is not particularly limited. From the viewpoint of imparting durability to polarizing elements or improving the impact resistance of optical laminates, as a material for transparent resin films, excellent transparency, mechanical strength, thermal stability, and moisture barrier properties can be preferably used. The thermoplastic resin. Specific examples of such resin materials include: cellulose resins such as triacetyl cellulose, polyester resins, polyether resins, polycarbonate resins, polycarbonate resins, polyamide resins, and polyimide resins. , Polyolefin resins, (meth)acrylic resins, cyclic polyolefin resins (nor ene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures of these.

透明樹脂膜20之厚度較佳為5～100 μm，更佳為10～60 μm，進而較佳為20～50 μm。透明樹脂膜20可為光學各向同性膜，亦可為光學各向異性膜。The thickness of the transparent resin film 20 is preferably 5 to 100 μm, more preferably 10 to 60 μm, and still more preferably 20 to 50 μm. The transparent resin film 20 may be an optically isotropic film or an optically anisotropic film.

透明樹脂膜20於23℃下之楊氏模數較佳為1.5～10 GPa，更佳為1.8～9 GPa。若透明樹脂膜之厚度及楊氏模數為上述範圍內，則有光學積層體之耐衝擊性提高之傾向。透明樹脂膜20於25℃下之破壞韌性值較佳為1.5～10 MPa・m1/2 ，更佳為2～6 MPa・m1/2 。破壞韌性值為上述範圍內之透明樹脂膜由於具有充分之黏稠強度，故而可補強玻璃膜，有助於抑制玻璃膜之破裂或龜裂。The Young's modulus of the transparent resin film 20 at 23° C. is preferably 1.5-10 GPa, more preferably 1.8-9 GPa. If the thickness and Young's modulus of the transparent resin film are within the above ranges, the impact resistance of the optical laminate tends to improve. The fracture toughness value of the transparent resin film 20 at 25° C. is preferably 1.5-10 MPa·m 1/2 , more preferably 2-6 MPa·m 1/2 . The transparent resin film with the fracture toughness value within the above range has sufficient viscous strength, so it can reinforce the glass film and help prevent the glass film from breaking or cracking.

作為偏光元件30，可使用於可見光區域之任一波長下顯示吸收二色性之膜。偏光元件30之單體透過率較佳為40%以上，更佳為41%以上，進而較佳為42%以上，尤佳為43%以上。偏光元件30之偏光度較佳為99.8%以上，更佳為99.9%以上，進而較佳為99.95%以上。As the polarizing element 30, a film that exhibits absorption dichroism at any wavelength in the visible light region can be used. The monomer transmittance of the polarizing element 30 is preferably 40% or more, more preferably 41% or more, still more preferably 42% or more, and particularly preferably 43% or more. The degree of polarization of the polarizing element 30 is preferably 99.8% or more, more preferably 99.9% or more, and still more preferably 99.95% or more.

作為偏光元件30，可視目的而採用任意之適當偏光元件。例如可列舉：使聚乙烯醇系膜、部分縮甲醛化聚乙烯醇系膜、乙烯-乙酸乙烯酯共聚物系部分皂化膜等親水性高分子膜吸附碘或二色性染料等二色性物質並進行單軸延伸而成者；聚乙烯醇之脫水處理物或聚氯乙烯之脫氯化氫處理物等多烯系配向膜等。又，亦可使用美國專利5,523,863號等所揭示之使包含二色性物質及液晶性化合物之液晶性組合物於一定方向上配向而成之賓主型偏光元件；或者美國專利6,049,428號等所揭示之使溶致型液晶於一定方向上配向而成之E型偏光元件等。As the polarizing element 30, any suitable polarizing element can be used depending on the purpose. Examples include: making hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and ethylene-vinyl acetate copolymer-based partially saponified films adsorb dichroic substances such as iodine or dichroic dyes It is formed by uniaxial stretching; polyene-based alignment films such as dehydrated polyvinyl alcohol or dehydrochlorinated polyvinyl chloride. In addition, a guest-host polarizing element in which a liquid crystal composition containing a dichroic substance and a liquid crystal compound is aligned in a certain direction as disclosed in U.S. Patent No. 5,523,863, etc.; or as disclosed in U.S. Patent No. 6,049,428, etc. E-type polarizing element formed by aligning lyotropic liquid crystal in a certain direction.

該等偏光元件之中，就具有較高之偏光度之方面而言，可較佳地使用使聚乙烯醇、或部分縮甲醛化聚乙烯醇等聚乙烯醇系膜吸附碘或二色性染料等二色性物質並使之於特定方向上配向而成之聚乙烯醇(PVA)系偏光元件。例如，藉由對PVA系膜實施碘染色及延伸，可獲得PVA系偏光元件。Among these polarizing elements, in terms of having a higher degree of polarization, polyvinyl alcohol films such as polyvinyl alcohol or partially formalized polyvinyl alcohol can be preferably used to adsorb iodine or dichroic dyes. Polyvinyl alcohol (PVA)-based polarizing element made of dichroic substances and aligned in a specific direction. For example, by performing iodine dyeing and stretching on a PVA-based film, a PVA-based polarizing element can be obtained.

偏光元件30之厚度例如為1～80 μm左右。偏光元件30之厚度可為3 μm以上或5 μm以上。作為偏光元件30，亦可使用厚度為25 μm以下、較佳為15 μm以下、更佳為10 μm以下之薄型偏光元件。藉由使用薄型偏光元件，可獲得薄型光學積層體。The thickness of the polarizing element 30 is, for example, about 1 to 80 μm. The thickness of the polarizing element 30 can be 3 μm or more or 5 μm or more. As the polarizing element 30, a thin polarizing element having a thickness of 25 μm or less, preferably 15 μm or less, and more preferably 10 μm or less can also be used. By using a thin polarizing element, a thin optical laminate can be obtained.

＜接著劑層＞ 玻璃膜10與透明樹脂膜20係經由接著劑層50而貼合。接著劑可為藉由熱能或光能等硬化之硬化型接著劑，亦可為黏著劑(感壓接著劑)。＜Adhesive layer＞ The glass film 10 and the transparent resin film 20 are bonded via the adhesive layer 50. The adhesive may be a hardening type adhesive that is cured by heat or light energy, or it may be an adhesive (pressure sensitive adhesive).

作為構成硬化型接著劑之材料，可列舉：熱硬化性樹脂、活性能量線硬化性樹脂等。作為此種樹脂之具體例，可列舉：環氧系樹脂、矽酮系樹脂、丙烯酸系樹脂、聚胺酯、聚醯胺、聚醚、聚乙烯醇等。作為黏著劑，可適當地選擇以丙烯酸系聚合物、矽酮系聚合物、聚酯、聚胺酯、聚醯胺、聚醚、氟系聚合物、橡膠系聚合物等作為基礎聚合物者來使用。於接著劑中亦可包含聚合起始劑、交聯劑、紫外線吸收劑、矽烷偶合劑等。Examples of materials constituting the curable adhesive include thermosetting resins, active energy ray curable resins, and the like. Specific examples of such resins include epoxy resins, silicone resins, acrylic resins, polyurethanes, polyamides, polyethers, polyvinyl alcohols, and the like. As the adhesive, an acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine polymer, rubber polymer, etc. can be appropriately selected and used as the base polymer. The adhesive may also include a polymerization initiator, a crosslinking agent, an ultraviolet absorber, a silane coupling agent, and the like.

為了以較小之厚度實現較高之接著性，構成接著劑層50之接著劑較佳為熱硬化型或活性能量線硬化型接著劑，其中，較佳為包含環氧系樹脂者。藉由經由包含環氧系樹脂之接著劑貼合玻璃膜與樹脂膜，可獲得玻璃膜難以破損，耐衝擊性更加優異之光學積層體。In order to achieve higher adhesiveness with a smaller thickness, the adhesive constituting the adhesive layer 50 is preferably a thermosetting or active energy ray-curing adhesive, and among them, it is preferably one containing epoxy resin. By bonding the glass film and the resin film via an adhesive containing epoxy resin, an optical laminate that is hard to break the glass film and has more excellent impact resistance can be obtained.

接著劑層50之厚度較佳為10 μm以下，更佳為0.05～8 μm，進而較佳為0.1～7 μm。若用於玻璃膜與透明膜之貼合之接著劑層50之厚度為上述範圍，則可獲得玻璃膜之破損得到抑制，耐衝擊性優異之光學積層體。The thickness of the adhesive layer 50 is preferably 10 μm or less, more preferably 0.05 to 8 μm, and still more preferably 0.1 to 7 μm. If the thickness of the adhesive layer 50 used for bonding the glass film and the transparent film is in the above range, an optical laminate having excellent impact resistance can be obtained with suppressed breakage of the glass film.

接著劑之硬化方法可視接著劑之種類而適當選擇。於接著劑為光硬化性接著劑之情形時，藉由紫外線照射進行硬化。紫外線之照射條件可視接著劑之種類、接著劑組合物之組成等而適當選擇。累計光量例如為100～2000 mJ/cm2 。於接著劑為熱硬化型接著劑之情形時，藉由加熱進行硬化。加熱條件可視接著劑之種類、接著劑組合物之組成等而適當選擇。關於加熱條件，例如溫度為50℃～200℃，加熱時間為30秒～30分鐘左右。The curing method of the adhesive can be appropriately selected depending on the type of the adhesive. When the adhesive is a photocurable adhesive, it is cured by ultraviolet radiation. The UV irradiation conditions can be appropriately selected depending on the type of adhesive, the composition of the adhesive composition, and the like. The accumulated light amount is, for example, 100 to 2000 mJ/cm 2 . When the adhesive is a thermosetting adhesive, it is cured by heating. The heating conditions may be appropriately selected depending on the type of adhesive, the composition of the adhesive composition, and the like. Regarding heating conditions, for example, the temperature is 50°C to 200°C, and the heating time is about 30 seconds to 30 minutes.

＜接著劑層中之異物＞ 於將玻璃膜與樹脂膜經由接著劑層貼合而成之光學積層體中，有於接著劑層中存在異物之情形。接著劑層中之異物可能成為光學缺陷。例如若於接著劑層中含有較大之異物，則透過光或反射光會因異物而產生折射、散射、反射，因此可能成為液晶顯示裝置或有機EL(Electroluminescence，電致發光)顯示裝置等之像素不良之原因。又，於照明或智慧窗口等用途中，能夠藉由目視視認之異物亦會成為光學缺陷。又，如圖2所示，於接著劑層50中所存在之異物x之尺寸較大之情形時，異物x成為自接著劑層50之表層突出之狀態，因此樹脂膜20之表面變形而形成凸部29。若形成此種凸部，則有因光之折射、散射、反射而導致顯示裝置之視認性變差、或產生照明之明暗不均之情形。＜Foreign matter in the adhesive layer＞ In the optical laminate formed by bonding a glass film and a resin film through an adhesive layer, there may be a foreign matter in the adhesive layer. The foreign matter in the adhesive layer may become an optical defect. For example, if a large foreign matter is contained in the adhesive layer, the transmitted or reflected light will be refracted, scattered, and reflected by the foreign matter, so it may become a liquid crystal display device or an organic EL (Electroluminescence, electroluminescence) display device, etc. Causes of defective pixels. In addition, in applications such as lighting or smart windows, foreign objects that can be visually recognized can also become optical defects. In addition, as shown in FIG. 2, when the size of the foreign matter x existing in the adhesive layer 50 is large, the foreign matter x protrudes from the surface layer of the adhesive layer 50, and therefore the surface of the resin film 20 is deformed to form Convex 29. If such a convex portion is formed, the visibility of the display device may deteriorate due to the refraction, scattering, and reflection of light, or the illumination may be uneven.

於第一觀點中，本發明之光學積層體之接著劑層50中所包含之100 μm以上的異物數量為10個/m2 以下。異物之有無係藉由光學積層體之目視觀察來確認。藉由光學顯微鏡對利用目視確認到之異物進行觀察，將異物之最大直徑為100 μm以上者之數量設為100 μm以上之異物數量。In the first viewpoint, the number of foreign substances of 100 μm or more contained in the adhesive layer 50 of the optical laminate of the present invention is 10 pieces/m 2 or less. The presence or absence of foreign matter is confirmed by visual observation of the optical laminate. Observe the visually confirmed foreign objects with an optical microscope, and set the number of foreign objects with a maximum diameter of 100 μm or more to the number of foreign objects with 100 μm or more.

混入至接著劑層50中之100 μm以上之異物由於會以光學缺陷被視認到，故而100 μm以上之異物之數量較佳為儘可能少。100 μm以上之異物數量較佳為7個/m2 以下，更佳為5個/m2 以下，進而較佳為3個/m2 以下，尤佳為2個/m2 以下。100 μm以上之異物數量理想的是未達1個/m2 。150 μm以上之異物數量理想的是0個/m2 。Since the foreign matter of 100 μm or more mixed into the adhesive layer 50 is visually recognized as an optical defect, the number of foreign matter of 100 μm or more is preferably as small as possible. The number of foreign objects of 100 μm or more is preferably 7 pieces/m 2 or less, more preferably 5 pieces/m 2 or less, still more preferably 3 pieces/m 2 or less, and particularly preferably 2 pieces/m 2 or less. The number of foreign objects above 100 μm is ideally less than 1/m 2 . The number of foreign objects above 150 μm is ideally 0/m 2 .

如上所述，若於接著劑層中包含異物，則光於異物與接著劑之界面產生折射、散射、反射，故而以光學缺陷被視認。於異物與接著劑之折射率差較小之情形時，於界面之光之折射、散射、反射較小。因此，即便於接著劑層中包含異物，只要異物與接著劑之折射率差較小，則亦難以以光學缺陷被視認。接著劑層中所包含之異物與接著劑之折射率差較佳為0.02以下。As described above, if foreign matter is included in the adhesive layer, light will be refracted, scattered, and reflected at the interface between the foreign matter and the adhesive, and therefore it is visually recognized as an optical defect. When the refractive index difference between the foreign body and the adhesive is small, the refraction, scattering, and reflection of light at the interface are small. Therefore, even if foreign matter is included in the adhesive layer, as long as the difference in refractive index between the foreign matter and the adhesive is small, it is difficult to be visually recognized as an optical defect. The difference in refractive index between the foreign matter contained in the adhesive layer and the adhesive is preferably 0.02 or less.

接著劑層中之100 μm以上之異物中，與接著劑層之折射率差超過0.02之異物之數量較佳為5個/m2 以下，更佳為3個/m2 以下，進而較佳為2個/m2 以下。100 μm以上且與接著劑之折射率差超過0.02之異物數量理想的是未達1個/m2 。折射率為波長590 nm下之測定值。接著劑層中之異物之折射率只要藉由如下方式特定即可：利用顯微紅外分光法等特定構成異物之物質，適用已知物質之折射率。The number of foreign matter of 100 μm or more in the adhesive layer whose refractive index difference with the adhesive layer exceeds 0.02 is preferably 5 pieces/m 2 or less, more preferably 3 pieces/m 2 or less, and still more preferably 2 pcs/m 2 or less. The number of foreign objects with a refractive index difference of more than 100 μm and the adhesive exceeding 0.02 is desirably less than 1/m 2 . The refractive index is measured at a wavelength of 590 nm. The refractive index of the foreign matter in the adhesive layer only needs to be specified by the following method: using micro-infrared spectroscopy and other specific substances that constitute the foreign matter, the refractive index of the known substance is applied.

接著劑層50中之未達100 μm之異物數量並無特別限定。但，若未達100 μm之異物數量增多，則有100 μm以上之粗大異物之數量亦增多之傾向。為了將100 μm以上之異物數量設為上述範圍內，5 μm以上之異物數量較佳為1300個/m2 以下，更佳為1000個/m2 以下，進而較佳為800個/m2 以下，尤佳為600個/m2 以下。又，即便為100 μm以下之異物，於存在密度較高之情形時亦可能成為光學缺陷，因此異物數量亦較佳為上述範圍內。The number of foreign matters less than 100 μm in the adhesive layer 50 is not particularly limited. However, if the number of foreign bodies below 100 μm increases, the number of coarse foreign bodies above 100 μm tends to increase. In order to keep the number of foreign objects of 100 μm or more within the above range, the number of foreign objects of 5 μm or more is preferably 1300 pieces/m 2 or less, more preferably 1000 pieces/m 2 or less, and still more preferably 800 pieces/m 2 or less , Particularly preferably less than 600/m 2 . In addition, even if it is a foreign matter of 100 μm or less, it may become an optical defect when the density is high. Therefore, the number of foreign matter is preferably within the above range.

於5 μm以上且未達100 μm之異物中，超過50 μm且未達100 μm之異物於顯示裝置等用途中，有以光學缺陷被視認之情形。因此，接著劑層50中之超過50 μm且未達100 μm之異物數量較佳為300個/m2 以下，更佳為200個/m2 以下，進而較佳為150個/m2 以下。Foreign matter above 5 μm and less than 100 μm, foreign matter more than 50 μm and less than 100 μm may be visually recognized as optical defects in applications such as display devices. Therefore, the number of foreign objects exceeding 50 μm and less than 100 μm in the adhesive layer 50 is preferably 300 pieces/m 2 or less, more preferably 200 pieces/m 2 or less, and even more preferably 150 pieces/m 2 or less.

於第二觀點中，本發明之光學積層體較佳為因接著劑層50中所包含之異物而形成於樹脂膜之表面之凸部的數量較少。如圖2所示，若接著劑層50中之異物x自接著劑層50之表層突出，則樹脂膜20之表面變形而形成凸部29。由於形成於樹脂膜20之表面之凸部如透鏡般發揮作用而使光折射，故而容易成為視認不良之原因，凸部之高度越大則越容易產生視認不良。In the second viewpoint, the optical laminate of the present invention preferably has a smaller number of convex portions formed on the surface of the resin film due to foreign substances contained in the adhesive layer 50. As shown in FIG. 2, if the foreign matter x in the adhesive layer 50 protrudes from the surface layer of the adhesive layer 50, the surface of the resin film 20 is deformed to form a convex portion 29. Since the convex portion formed on the surface of the resin film 20 acts like a lens to refract light, it is likely to cause poor visibility. The greater the height of the convex portion, the more likely it is to cause poor visibility.

有自接著劑層50之表面突出之異物之高度H越大，樹脂膜20之表面之凸部高度亦變得越大之傾向，尤其是於自接著劑層之表面突出之異物之突出高度H為7 μm以上的情形時，容易產生視認不良。因此，接著劑層之表面之突出高度H為7 μm以上之異物x的數量較佳為10個/m2 以下。突出高度H為7 μm以上之異物之數量更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。突出高度H為7 μm以上之異物之數量理想的是未達1個/m2 。The greater the height H of the foreign matter protruding from the surface of the adhesive layer 50, the greater the height of the convex portion of the surface of the resin film 20, especially the protruding height H of the foreign matter protruding from the surface of the adhesive layer In the case of 7 μm or more, poor visibility is likely to occur. Therefore, the number of foreign objects x whose protrusion height H on the surface of the adhesive layer is 7 μm or more is preferably 10 pieces/m 2 or less. The number of foreign objects with a protrusion height H of 7 μm or more is more preferably 7 pieces/m 2 or less, more preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, and most preferably 2 pieces/m 2 the following. The number of foreign objects whose protrusion height H is 7 μm or more is desirably less than 1/m 2 .

於液晶顯示裝置或有機EL顯示裝置等顯示器中，有由較小之凸部所引起之光之折射亦以光學缺陷被視認之傾向。因此，於將光學積層體用於顯示器用途之情形時，接著劑層50之表面之突出高度H為5 μm以上之異物的數量較佳為10個/m2 以下，更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。突出高度H為5 μm以上之異物之數量理想的是未達1個/m2 。In displays such as liquid crystal display devices or organic EL display devices, the refraction of light caused by smaller convex portions tends to be recognized as optical defects. Therefore, when the optical laminate is used for display applications, the number of foreign objects whose protrusion height H of the surface of the adhesive layer 50 is 5 μm or more is preferably 10 pieces/m 2 or less, more preferably 7 pieces/m 2 or less, more preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, most preferably 2 pieces/m 2 or less. The number of foreign objects with a protrusion height H of 5 μm or more is desirably less than 1/m 2 .

接著劑層50之表面之異物之突出高度H係基於藉由垂直掃描式低相干性干涉法(ISO25178)所測得之接著劑層之三維表面形狀求出(參照圖4B)。於接著劑層之三維表面形狀之測定中，使用藉由浸漬於水中或者加溫等，於接著劑層50與樹脂膜20之界面進行剝離而去除樹脂膜20後所得之試樣。The protrusion height H of the foreign matter on the surface of the adhesive layer 50 is calculated based on the three-dimensional surface shape of the adhesive layer measured by the vertical scanning low-coherence interferometry (ISO25178) (refer to FIG. 4B). In the measurement of the three-dimensional surface shape of the adhesive layer, a sample obtained by removing the resin film 20 by peeling off the interface between the adhesive layer 50 and the resin film 20 by immersing in water or heating or the like is used.

自接著劑層50突出之異物之形狀亦可基於突出部之傾斜角來進行評價。自接著劑層50之表面突出之異物之傾斜角θ越大，形成於設置於接著劑層上之樹脂膜20之表面之凸部29之傾斜角亦變得越大，而容易以光學缺陷被視認。尤其是於突出異物之傾斜角θ為10°以上之情形時，容易產生視認不良。因此，接著劑層50表面之突出部傾斜角θ為10°以上之異物的數量較佳為10個/m2 以下。傾斜角θ為10°以上之異物之數量更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。突出部之傾斜角θ為10°以上之異物之數量理想的是未達1個/m2 。The shape of the foreign matter protruding from the adhesive layer 50 can also be evaluated based on the inclination angle of the protrusion. The larger the inclination angle θ of the foreign matter protruding from the surface of the adhesive layer 50 is, the larger the inclination angle of the convex portion 29 formed on the surface of the resin film 20 provided on the adhesive layer becomes, and it is easy to be affected by optical defects. Visual recognition. Especially when the inclination angle θ of the protruding foreign matter is 10° or more, it is easy to cause poor visual recognition. Therefore, it is preferable that the number of foreign objects whose inclination angle θ of the protruding portion on the surface of the adhesive layer 50 is 10° or more is 10 pieces/m 2 or less. The number of foreign objects with an inclination angle θ of 10° or more is more preferably 7 pieces/m 2 or less, more preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, and most preferably 2 pieces/m 2 the following. The number of foreign objects whose inclination angle θ of the protruding part is 10° or more is ideally less than 1/m 2 .

於液晶顯示裝置或有機EL顯示裝置等顯示器中，有由傾斜角較小之凸部所引起之光之折射亦被視認之傾向。因此，於將光學積層體用於顯示器用途之情形時，接著劑層50之表面之突出部傾斜角為3°以上之異物的數量較佳為10個/m2 以下，更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。突出部傾斜角θ為3°以上之異物之數量理想的是未達1個/m2 。In a display such as a liquid crystal display device or an organic EL display device, there is a tendency that the refraction of light caused by the convex portion with a small inclination angle is also recognized. Therefore, when the optical layered body is used for display purposes, the number of foreign objects whose inclination angle of the protrusion on the surface of the adhesive layer 50 is 3° or more is preferably 10 pieces/m 2 or less, more preferably 7 pieces/ m 2 or less, more preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, most preferably 2 pieces/m 2 or less. The number of foreign objects with the inclination angle θ of the protruding part of 3° or more is desirably less than 1/m 2 .

如圖3所示，異物之突出部傾斜角θ係藉由將突出部之剖面形狀近似為底邊之長度為

Figure 02_image001
、高度H之等腰三角形而算出。突出部之傾斜角θ(等腰三角形之底角)由arctan(2H/
Figure 02_image001
)表示。底邊之長度
Figure 02_image001
等於異物之大小(最大徑)，可藉由光學積層體之光學顯微鏡觀察而求出。As shown in Figure 3, the inclination angle θ of the protruding part of the foreign body is approximated by the cross-sectional shape of the protruding part as the length of the base as
Figure 02_image001
, Height H is calculated from an isosceles triangle. The inclination angle θ of the protrusion (the base angle of the isosceles triangle) is determined by arctan(2H/
Figure 02_image001
) Means. Length of bottom
Figure 02_image001
The size (maximum diameter) equal to the foreign body can be obtained by observing the optical laminate with an optical microscope.

於因接著劑層50中之異物而於樹脂膜20之表面形成凸部之情形時，就抑制因凸部而產生光學缺陷之觀點而言，較佳為成為凸部形成之原因之異物x之突出高度H較小，且突出部之傾斜角θ較小。接著劑層50中之異物x之突出部較佳為高度H為7 μm以下且傾斜角θ為10°以下。因此，滿足接著劑層50之表面之突出部高度H為7 μm以上或傾斜角θ為10°以上之任一者或兩者的異物之數量較佳為10個/m2 以下，更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。滿足突出部之高度H為7 μm以上或傾斜角θ為10°以上之任一者或兩者之異物之數量理想的是未達1個/m2 。In the case where projections are formed on the surface of the resin film 20 due to the foreign matter in the adhesive layer 50, from the viewpoint of suppressing the generation of optical defects due to the projections, the foreign matter x that causes the formation of the projections is preferred The protrusion height H is small, and the inclination angle θ of the protrusion is small. The protrusion of the foreign matter x in the adhesive layer 50 preferably has a height H of 7 μm or less and an inclination angle θ of 10° or less. Therefore, the number of foreign objects satisfying either or both of the protrusion height H of the surface of the adhesive layer 50 being 7 μm or more or the inclination angle θ of 10° or more is preferably 10 pieces/m 2 or less, more preferably 7 pieces/m 2 or less, more preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, most preferably 2 pieces/m 2 or less. It is desirable that the number of foreign objects satisfying either or both of the height H of the protruding portion being 7 μm or more or the inclination angle θ of 10° or more is less than 1/m 2 .

於液晶顯示裝置或有機EL顯示裝置等顯示器中，有由高度較小之凸部、或傾斜角較小之凸部所引起之光之折射亦被視認之傾向。因此，於將光學積層體用於顯示器用途之情形時，滿足黏著劑層50之表面之突出部高度H為5 μm以上或傾斜角θ為3°以上之任一者或兩者的異物之數量較佳為10個/m2 以下，更佳為7個/m2 以下，進而較佳為5個/m2 以下，尤佳為3個/m2 以下，最佳為2個/m2 以下。滿足突出部之高度H為5 μm以上或傾斜角θ為3°以上之任一者或兩者之異物之數量理想的是未達1個/m2 。In displays such as liquid crystal display devices or organic EL display devices, there is a tendency that light refraction caused by protrusions with a small height or protrusions with a small tilt angle is also recognized. Therefore, when the optical layered body is used for display purposes, the number of foreign objects that satisfy either or both of the protrusion height H of the surface of the adhesive layer 50 is 5 μm or more or the inclination angle θ is 3° or more Preferably it is 10 pieces/m 2 or less, more preferably 7 pieces/m 2 or less, further preferably 5 pieces/m 2 or less, particularly preferably 3 pieces/m 2 or less, most preferably 2 pieces/m 2 or less . The number of foreign objects satisfying either or both of the height H of the protruding portion being 5 μm or more or the inclination angle θ of 3° or more is desirably less than 1/m 2 .

＜接著劑層中之異物數量之控制＞ 於在玻璃膜上經由接著劑層貼合樹脂膜而成之光學積層體中，接著劑層中之異物之大部分係源自玻璃膜表面之附著異物者。玻璃膜之製造與顯示裝置等光器件之製造、或光器件用構件之製造相比，大多情況下於淨化度較低之環境下進行。因此，於剛製造後之玻璃膜附著有大量異物。為了減少接著劑層中之異物數量，較佳為於潔淨環境下進行玻璃膜之洗淨，於洗淨後之玻璃膜之表面積層樹脂膜。＜Control of the amount of foreign matter in the adhesive layer＞ In an optical laminate formed by laminating a resin film on a glass film via an adhesive layer, most of the foreign matter in the adhesive layer originates from the adherent foreign matter on the surface of the glass film. Compared with the manufacture of optical devices such as display devices or the manufacture of components for optical devices, the manufacture of glass films is usually carried out in an environment with a lower degree of purification. Therefore, a large amount of foreign matter adheres to the glass film immediately after manufacture. In order to reduce the amount of foreign matter in the adhesive layer, it is preferable to clean the glass film in a clean environment. After the cleaning, the surface area of the glass film is layered with a resin film.

玻璃膜之洗淨方法只要能夠將附著異物數量減少至上述範圍，則無特別限定，可為乾式法及濕式法之任一者。作為乾式法，可列舉：空氣之吹送、利用UV(Ultraviolet，紫外線)或臭氧等之照射進行之異物分解、利用黏著輥或黏著片材進行之異物去除、毛刷洗淨、噴射洗淨等。作為濕式洗淨，可列舉：利用純水、酸或鹼、或有機溶劑等洗淨液進行之洗淨、於在玻璃膜之表面附著有洗淨液等液體之狀態下、或將玻璃膜浸漬於液體中之狀態下利用毛刷或海綿進行之洗淨、超音波洗淨、雙流體洗淨等。The cleaning method of the glass film is not particularly limited as long as the number of adhering foreign substances can be reduced to the above-mentioned range, and it may be either a dry method or a wet method. Examples of the dry method include: blowing of air, decomposition of foreign matter by UV (Ultraviolet) or ozone, etc., removal of foreign matter by adhesive rollers or adhesive sheets, brush cleaning, spray cleaning, and the like. Examples of wet cleaning include: cleaning with pure water, acid or alkali, or organic solvents and other cleaning solutions, in a state where a cleaning solution or other liquid adheres to the surface of the glass film, or the glass film Washing with brush or sponge while immersed in liquid, ultrasonic washing, two-fluid washing, etc.

玻璃由於表面自由能高，附著異物之密接性高，故而有僅利用與液體之接觸無法充分去除異物之情形。又，由於在起因於玻璃膜之製造環境之附著異物中包含多種多樣之物質，故而有藉由利用有機溶劑等使異物溶解之方法亦無法充分去除異物之情形。於顯示裝置用之玻璃板之洗淨中，已知有藉由利用強鹼使玻璃之表層溶解，而去除附著異物之方法。該方法雖然異物之去除效果大，但於應用於玻璃膜之情形時，可能因玻璃膜之厚度減少而導致強度降低。Because glass has high surface free energy and high adhesion to foreign matter, there are cases where foreign matter cannot be removed sufficiently by contact with liquid. In addition, since the adhering foreign matter caused by the manufacturing environment of the glass film contains a variety of substances, the foreign matter may not be sufficiently removed by dissolving the foreign matter using an organic solvent or the like. In the cleaning of glass plates for display devices, it is known that the surface layer of the glass is dissolved by a strong alkali to remove attached foreign matter. Although this method has a great effect in removing foreign matter, when applied to a glass film, the strength may be reduced due to the decrease in the thickness of the glass film.

玻璃膜與塑膠膜相比，硬度較高，難以產生損傷，因此於玻璃膜之洗淨中可應用藉由物理衝擊力來去除附著異物之方法。其中，就能夠適度去除附著異物之方面而言，作為乾式洗淨，較佳為毛刷洗淨或噴射洗淨，作為濕式洗淨，較佳為雙流體洗淨。Compared with the plastic film, the glass film has higher hardness and is difficult to cause damage. Therefore, the method of removing the attached foreign matter by physical impact can be used in the cleaning of the glass film. Among them, in terms of being able to appropriately remove attached foreign matter, dry cleaning is preferably brush cleaning or jet cleaning, and wet cleaning is preferably two-fluid cleaning.

於毛刷洗淨中，使用具備旋轉毛刷之接觸式網片清潔刷等。於一面卷對卷搬送玻璃膜一面連續地進行表面洗淨之情形時，就將洗淨品質保持為一定之觀點而言，較佳為具備用於藉由抽吸方式等去除附著於毛刷之異物之機構。In the brush cleaning, use a contact mesh cleaning brush with a rotating brush, etc. When the glass film is transported roll-to-roll while the surface is continuously cleaned, from the viewpoint of maintaining the cleaning quality at a certain level, it is preferable to provide a brush for removing adhesion to the bristles by suction, etc. Foreign body organization.

作為噴射洗淨，較佳為乾冰噴射。於乾冰噴射中，以高速對玻璃膜吹送乾冰顆粒。若乾冰進入至玻璃膜與附著異物之間並急遽地汽化，則體積急遽膨脹，藉由該體積變化而可剝離去除所附著之異物。又，乾冰由於會汽化，故而噴射粒不會以異物殘存。As spray washing, dry ice spraying is preferred. In dry ice blasting, dry ice particles are blown onto the glass film at high speed. When some ice enters between the glass film and the attached foreign matter and vaporizes rapidly, the volume expands rapidly, and the attached foreign matter can be peeled off by the volume change. In addition, since dry ice vaporizes, spray particles will not remain as foreign matter.

雙流體洗淨係將混合氣體與液體所得之混合流體自雙流體噴嘴供給至玻璃膜之表面之處理。混合流體中之液滴會碰撞玻璃膜之表面，藉由該衝擊可去除附著於玻璃膜之表面之異物。作為雙流體洗淨之液體及氣體，一般使用水及空氣。作為氣體(載氣)，亦可使用氮氣、氧氣、二氧化碳、氫氣、臭氧、氬氣等。雙流體噴嘴之載氣壓較佳為0.1～0.6 MPa左右，液壓較佳為0.05～0.5 MPa左右。Two-fluid cleaning is a process in which a mixed fluid obtained by mixing gas and liquid is supplied to the surface of the glass film from a two-fluid nozzle. The droplets in the mixed fluid collide with the surface of the glass film, and the foreign matter adhering to the surface of the glass film can be removed by the impact. As the liquid and gas for two-fluid cleaning, water and air are generally used. As the gas (carrier gas), nitrogen, oxygen, carbon dioxide, hydrogen, ozone, argon, etc. can also be used. The carrier gas pressure of the two-fluid nozzle is preferably about 0.1-0.6 MPa, and the hydraulic pressure is preferably about 0.05-0.5 MPa.

洗淨較佳為一面以卷對卷來搬送玻璃膜一面連續地進行。洗淨可僅對玻璃膜之單面實施，亦可洗淨玻璃膜之兩面。於僅洗淨單面之情形時，只要洗淨供積層樹脂膜之面(第一主面)即可。於洗淨玻璃膜之兩面之情形時，一面之洗淨方法與另一面之洗淨方法可相同亦可不同。Cleaning is preferably performed continuously while conveying the glass film roll-to-roll. The cleaning can be performed on only one side of the glass film, or both sides of the glass film can be washed. When only one side is cleaned, it is sufficient to clean the side (first main side) on which the resin film is laminated. When cleaning both sides of the glass film, the cleaning method on one side and the cleaning method on the other side may be the same or different.

於藉由卷對卷進行洗淨之情形時，洗淨可以離線進行，亦可以線內進行。於線內洗淨中，於將玻璃膜洗淨後且捲取成卷狀之前之期間，於洗淨後之玻璃膜之表面經由接著劑層積層樹脂膜。於離線洗淨中，將洗淨後之玻璃膜暫時捲取成卷狀。於將洗淨後之玻璃膜捲取成卷狀之前，為了防止異物再附著於洗淨面等，可暫時黏著保護膜。In the case of roll-to-roll cleaning, the cleaning can be done offline or in-line. In the in-line cleaning, after the glass film is cleaned and before being wound into a roll, a resin film is laminated on the surface of the cleaned glass film via an adhesive. In offline cleaning, the cleaned glass film is temporarily wound into a roll. Before winding the cleaned glass film into a roll shape, in order to prevent foreign matter from adhering to the cleaned surface, etc., a protective film can be temporarily attached.

＜玻璃膜與樹脂膜之積層＞ 藉由於洗淨後之玻璃膜10上經由接著劑層50積層樹脂膜，可獲得光學積層體。於玻璃膜10為長條狀之情形時，較佳為一面藉由卷對卷搬送玻璃膜，一面進行積層。＜Laminated glass film and resin film＞ By laminating a resin film through the adhesive layer 50 on the cleaned glass film 10, an optical laminate can be obtained. When the glass film 10 is a long strip, it is preferable to laminate the glass film while conveying the glass film by roll-to-roll.

於在玻璃膜10之第一主面上設置有複數個樹脂膜之情形時，形成光學積層體時之積層順序並無特別限定。例如可於玻璃膜10上依序積層透明樹脂膜20及偏光元件30等，亦可將預先積層有複數個樹脂膜之積層膜(例如透明樹脂膜20與偏光元件30之積層體)與玻璃膜10積層。透明樹脂膜20與偏光元件30較佳為經由接著劑層(未圖示)進行積層。作為設置於透明樹脂膜與偏光元件30之間之接著劑，可使用作為構成接著劑層50之接著劑於前文例示之接著劑。In the case where a plurality of resin films are provided on the first main surface of the glass film 10, the order of lamination when forming the optical laminate is not particularly limited. For example, a transparent resin film 20 and a polarizing element 30 can be sequentially laminated on the glass film 10, or a laminated film (for example, a laminated body of a transparent resin film 20 and a polarizing element 30) and a glass film can be laminated with a plurality of resin films in advance. 10 buildup. The transparent resin film 20 and the polarizing element 30 are preferably laminated via an adhesive layer (not shown). As the adhesive provided between the transparent resin film and the polarizing element 30, the adhesive exemplified above as the adhesive constituting the adhesive layer 50 can be used.

＜附加層＞ 光學積層體亦可具備玻璃膜10、接著劑層50及樹脂膜20、30以外之附加性層。例如，光學積層體101亦可具備用以與構成器件之其他構件貼合之黏著劑層80。例如，可經由黏著劑層80將光學積層體101與有機EL單元或液晶單元等圖像顯示單元貼合。構成黏著劑層80之黏著劑並無特別限制，可適當選擇以丙烯酸系聚合物、矽酮系聚合物、聚酯、聚胺酯、聚醯胺、聚醚、氟系聚合物、橡膠系聚合物等作為基礎聚合物者來使用。尤佳為丙烯酸系黏著劑等透明性優異，顯示適度之濡濕性、凝集性及接著性，且耐候性或耐熱性等優異之黏著劑。＜Additional layer＞ The optical laminate may include additional layers other than the glass film 10, the adhesive layer 50, and the resin films 20 and 30. For example, the optical layered body 101 may include an adhesive layer 80 for bonding with other members constituting the device. For example, the optical laminate 101 can be bonded to an image display unit such as an organic EL cell or a liquid crystal cell via the adhesive layer 80. The adhesive constituting the adhesive layer 80 is not particularly limited, and acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine polymer, rubber polymer, etc. can be appropriately selected. Used as a base polymer. Particularly preferred is an adhesive that has excellent transparency such as acrylic adhesives, exhibits moderate wettability, cohesiveness, and adhesion, and has excellent weather resistance or heat resistance.

黏著劑層80亦可為積層2層以上而成者。黏著劑層80之厚度例如為1～300 μm左右，較佳為5～50 μm，更佳為10～30 μm。The adhesive layer 80 may be formed by stacking two or more layers. The thickness of the adhesive layer 80 is, for example, about 1 to 300 μm, preferably 5 to 50 μm, and more preferably 10 to 30 μm.

較佳為於黏著劑層80之表面暫時黏有隔離件91。隔離件91於在將光學積層體與其他構件貼合之前之期間保護黏著劑層80之表面。作為隔離件91之構成材料，可適宜地使用丙烯酸、聚烯烴、環狀聚烯烴、聚酯等塑膠膜。Preferably, a spacer 91 is temporarily attached to the surface of the adhesive layer 80. The spacer 91 protects the surface of the adhesive layer 80 before bonding the optical laminate to other components. As a constituent material of the separator 91, plastic films such as acrylic, polyolefin, cyclic polyolefin, polyester, etc. can be suitably used.

隔離件91之厚度通常為5～200 μm左右，較佳為10～60 μm，更佳為15～40 μm，進而較佳為20～30 μm。較佳為對於隔離件91之表面實施離型處理。作為離型劑，可列舉：矽酮系材料、氟系材料、長鏈烷基系材料、脂肪酸醯胺系材料等。亦可將用作黏著劑層80之形成用基材之膜直接作為隔離件。The thickness of the spacer 91 is usually about 5 to 200 μm, preferably 10 to 60 μm, more preferably 15 to 40 μm, and still more preferably 20 to 30 μm. It is preferable to perform a release treatment on the surface of the spacer 91. Examples of the release agent include silicone-based materials, fluorine-based materials, long-chain alkyl-based materials, and fatty acid amide-based materials. The film used as the base material for forming the adhesive layer 80 may be directly used as a separator.

如圖1所示，亦可於玻璃膜10之第二主面暫時黏有表面保護膜92。表面保護膜92於在將光學積層體供於使用之前之期間保護玻璃膜等。藉由於玻璃膜10之表面暫時黏有表面保護膜92，例如對於前端較尖之掉落物亦可防止產生損傷、孔等。As shown in FIG. 1, a surface protection film 92 may be temporarily adhered to the second main surface of the glass film 10. The surface protection film 92 protects the glass film and the like during the period before the optical laminate is used. Since the surface protection film 92 is temporarily adhered to the surface of the glass film 10, for example, damages, holes, etc. can be prevented from falling objects with a sharp tip.

作為表面保護膜92之材料，可較佳地使用與上述隔離件91相同之塑膠材料，可列舉聚對苯二甲酸乙二酯、聚乙烯等。表面保護膜92較佳為於玻璃膜之附設面具有黏著層。作為表面保護膜92，可使用藉由共擠壓將構成膜之樹脂層與黏著層積層而成之自黏著膜。表面保護膜92之厚度例如為20 μm～1000 μm左右，較佳為30～500 μm，更佳為40～200 μm，進而較佳為50～150 μm。As the material of the surface protection film 92, the same plastic material as the above-mentioned spacer 91 can be preferably used, such as polyethylene terephthalate, polyethylene, and the like. The surface protection film 92 preferably has an adhesive layer on the attachment surface of the glass film. As the surface protective film 92, a self-adhesive film formed by laminating a resin layer and an adhesive layer constituting the film by co-extrusion can be used. The thickness of the surface protection film 92 is, for example, about 20 μm to 1000 μm, preferably 30 to 500 μm, more preferably 40 to 200 μm, and still more preferably 50 to 150 μm.

於圖1中，示出於玻璃膜10之第一主面積層透明樹脂膜20及偏光元件30作為樹脂膜而成之光學積層體101，但樹脂膜亦可僅為1層。例如，可於玻璃膜之第一主面經由接著劑層貼合有偏光元件。又，亦可於玻璃膜之第一主面僅積層透明樹脂膜。In FIG. 1, the optical laminate 101 in which the transparent resin film 20 and the polarizing element 30 of the first main area layer of the glass film 10 are used as resin films is shown, but the resin film may be only one layer. For example, a polarizing element can be attached to the first main surface of the glass film via an adhesive layer. Moreover, only a transparent resin film may be laminated on the first main surface of the glass film.

光學積層體亦可於偏光元件30與黏著劑層80之間具備其他樹脂膜等。藉由於偏光元件30與黏著劑層80之間設置透明膜，可進一步提高偏光元件之耐久性。配置於偏光元件30與黏著劑層80之間之透明膜之材料、厚度、光學特性等可與配置於偏光元件30與玻璃膜10之間之透明樹脂膜20相同。透明膜可為光學各向同性膜，亦可為光學各向異性膜。藉由於偏光元件30與黏著劑層80之間使用光學各向異性膜，可表現各種功能。The optical laminate may be provided with other resin films and the like between the polarizing element 30 and the adhesive layer 80. By providing a transparent film between the polarizing element 30 and the adhesive layer 80, the durability of the polarizing element can be further improved. The material, thickness, and optical properties of the transparent film disposed between the polarizing element 30 and the adhesive layer 80 may be the same as the transparent resin film 20 disposed between the polarizing element 30 and the glass film 10. The transparent film may be an optically isotropic film or an optically anisotropic film. By using an optically anisotropic film between the polarizing element 30 and the adhesive layer 80, various functions can be performed.

例如，於在有機EL單元之表面貼合有光學積層體之情形時，透明膜及偏光元件30構成圓偏光板，藉此可遮斷由有機EL元件之單元之金屬電極等所引起之外界光之反射，而提高顯示之視認性。作為透明膜，亦可使用斜向延伸膜。For example, when an optical laminate is attached to the surface of the organic EL element, the transparent film and the polarizing element 30 constitute a circular polarizing plate, which can block the outer boundary light caused by the metal electrode of the organic EL element. The reflection improves the visibility of the display. As the transparent film, an obliquely stretched film can also be used.

於在液晶單元之表面貼合有光學積層體之情形時，可藉由光學各向異性膜進行各種光學補償。用於光學補償之光學各向異性膜之種類只要視液晶單元之方式等適當選擇即可。When an optical laminate is attached to the surface of the liquid crystal cell, various optical compensations can be performed with an optically anisotropic film. The type of optically anisotropic film used for optical compensation may be appropriately selected depending on the method of the liquid crystal cell.

光學積層體亦可具有上述以外之各種功能性賦予層。作為功能性賦予層，例如可列舉：抗反射層、防污層、光擴散層、易接著層、防靜電層等。The optical layered body may have various functional providing layers other than the above. As the functionality imparting layer, for example, an anti-reflection layer, an antifouling layer, a light diffusion layer, an easily bonding layer, an antistatic layer, etc. may be mentioned.

亦可對於玻璃膜實施加飾印刷。加飾印刷之印刷厚度例如為5～100 μm左右。加飾印刷可於玻璃膜之任一面實施。又，亦可對玻璃膜以外之光學積層體之構成構件實施加飾印刷。例如亦可對偏光元件30或透明樹脂膜20實施加飾印刷。藉由將設置有加飾印刷部之透明膜(加飾印刷膜)與光學積層體之構成構件以卷對卷方式進行積層，可獲得具有加飾印刷部之光學積層體。Decorative printing can also be applied to the glass film. The printing thickness of decorative printing is about 5-100 μm, for example. Decorative printing can be implemented on either side of the glass film. In addition, decorative printing may be performed on the constituent members of the optical laminate other than the glass film. For example, decoration printing may be performed on the polarizing element 30 or the transparent resin film 20. By laminating the transparent film (decoration printing film) provided with the decorative printing section and the constituent members of the optical laminate in a roll-to-roll manner, an optical laminate having the decorative printing section can be obtained.

於玻璃膜10之第一主面積層樹脂膜而成之光學積層體由於具備玻璃膜，故而硬度較高。又，光學積層體由於在玻璃膜10之第一主面積層有樹脂膜，故而防止玻璃膜10之破損而耐衝擊性優異。認為其原因在於，第一主面側可有效地避開施加於玻璃膜之第二主面之衝擊。尤其是於在玻璃膜10之第一主面上經由透明樹脂膜20設置有偏光元件30之情形時，耐衝擊性顯著提高。由於玻璃膜不易破損，故而能夠減小玻璃膜之厚度，隨之可使光學積層體輕量化。The optical laminate formed by layering a resin film on the first main area of the glass film 10 has a high hardness because it includes a glass film. In addition, since the optical layered body has a resin film layered on the first main area of the glass film 10, the glass film 10 is prevented from being damaged and has excellent impact resistance. It is believed that the reason is that the first main surface side can effectively avoid the impact applied to the second main surface of the glass film. Especially in the case where the polarizing element 30 is provided on the first main surface of the glass film 10 via the transparent resin film 20, the impact resistance is significantly improved. Since the glass film is not easily damaged, the thickness of the glass film can be reduced, and the optical laminate can be lightened accordingly.

進而，玻璃材料由於水分或氣體之遮斷性較高，對於有機溶劑、酸、鹼等之耐久性較高，且耐熱性優異，故而藉由將玻璃膜10配置於表面，與僅具有樹脂膜20之情形相比，對偏光元件30之保護性能提高，可防止偏光元件劣化。Furthermore, the glass material has high moisture or gas barrier properties, high durability against organic solvents, acids, alkalis, etc., and excellent heat resistance. Therefore, by arranging the glass film 10 on the surface, it is better than having only a resin film. Compared with the case of 20, the protection performance of the polarizing element 30 is improved, and the deterioration of the polarizing element can be prevented.

本發明之光學積層體可為單片，亦可為長條狀。就能夠應用於卷對卷製程而提高器件之生產性之觀點而言，光學積層體較佳為長條狀。由於玻璃膜具有可撓性，故而光學積層體亦具有可撓性。因此，長條狀光學積層體係以卷狀捲繞體之形式提供。長條狀光學積層體之長度較佳為100 m以上，更佳為300 m以上，進而較佳為500 m以上。長條狀光學積層體之寬度例如為50～3000 mm，較佳為100～2000 mm。The optical laminate of the present invention may be a single sheet or a long strip. From the viewpoint that it can be applied to the roll-to-roll process to improve the productivity of the device, the optical laminate is preferably elongated. Since the glass film has flexibility, the optical laminate also has flexibility. Therefore, the long optical laminated system is provided in the form of a roll. The length of the elongated optical laminate is preferably 100 m or more, more preferably 300 m or more, and still more preferably 500 m or more. The width of the elongated optical laminate is, for example, 50 to 3000 mm, preferably 100 to 2000 mm.

本發明之光學積層體可應用於半導體元件等基板材料、或顯示裝置、照明裝置、智慧窗口、太陽電池等光器件等。於光器件中，玻璃膜可作為用於形成元件等之基板材料來應用，亦可作為用於保護器件表面之覆蓋玻璃來應用。The optical laminate of the present invention can be applied to substrate materials such as semiconductor elements, or optical devices such as display devices, lighting devices, smart windows, and solar cells. In optical devices, the glass film can be used as a substrate material for forming components, and can also be used as a cover glass for protecting the surface of the device.

玻璃材料由於具有表面光澤，故而藉由將玻璃膜配置於圖像顯示裝置等器件之表面，可獲得較美之眩光感。又，由於玻璃材料為光學各向同性，故而難以產生反射光之色差，可實現較高之視認性。進而，玻璃膜之表面硬度較高，耐衝擊性優異。因此，於將光學積層體以玻璃膜成為視認側表面之方式配置之圖像顯示裝置中，由於玻璃膜具有作為保護板之功能，故而無需另外設置窗口層。因此，可簡化圖像顯示裝置之製造步驟，並且減少構成構件數，藉此能夠實現器件之薄型化及輕量化。The glass material has surface gloss, so by arranging the glass film on the surface of the image display device and other devices, a more beautiful glare can be obtained. In addition, since the glass material is optically isotropic, it is difficult to produce chromatic aberration of reflected light, and high visibility can be achieved. Furthermore, the glass film has high surface hardness and excellent impact resistance. Therefore, in the image display device in which the optical laminate is arranged such that the glass film becomes the visible side surface, since the glass film has a function as a protective plate, there is no need to separately provide a window layer. Therefore, the manufacturing steps of the image display device can be simplified, and the number of constituent members can be reduced, thereby enabling the device to be thinner and lighter.

又，於本發明中，由於設置於玻璃膜與樹脂膜之間之接著劑層中之異物數量較少，起因於異物之樹脂膜表面之變形(凸部之形成)得到抑制，故而不易產生光器件中之光學缺陷。因此，藉由使用本發明之光學積層體，可獲得視認性優異之光器件。又，由於接著劑層中之粗大異物、或起因於異物之樹脂膜表面之凸部之數量密度較小，故而於加工為器件之尺寸(例如顯示器之畫面尺寸)時，即便將包含起因於異物之缺陷之製品作為不良品排除，亦能夠確保充分之良率。 [實施例]In addition, in the present invention, since the amount of foreign matter in the adhesive layer provided between the glass film and the resin film is small, the deformation of the resin film surface (formation of protrusions) caused by the foreign matter is suppressed, so it is difficult to generate light. Optical defects in the device. Therefore, by using the optical laminate of the present invention, an optical device with excellent visibility can be obtained. In addition, since the coarse foreign matter in the adhesive layer, or the number density of the protrusions on the surface of the resin film caused by the foreign matter is small, when processing the size of the device (such as the screen size of the display), even if the foreign matter is included The defective products are eliminated as defective products, which can also ensure sufficient yield. [Example]

以下，列舉具體例對本發明更詳細地進行說明，但本發明並不限定於下述具體例。Hereinafter, the present invention will be explained in more detail with specific examples, but the present invention is not limited to the following specific examples.

[評價1：利用玻璃膜之洗淨所獲得之附著異物數量之減少效果] ＜比較例1＞ 自厚度100 μm之玻璃膜之卷狀捲繞體切下100 mm×100 mm之試樣，藉由光學顯微鏡觀察表面，計數觀察範圍內之5 μm以上之附著異物之總數。又，計數附著異物中大小為100 μm以上者之數量。對100片試樣(合計面積：1 m2 )進行該作業，求出異物數量之合計。[Evaluation 1: The effect of reducing the number of adhered foreign matter obtained by washing the glass film] <Comparative Example 1> A sample of 100 mm×100 mm was cut from a roll-shaped winding body of a glass film with a thickness of 100 μm. Observe the surface with an optical microscope, and count the total number of foreign matter above 5 μm in the observation range. In addition, count the number of attached foreign matter with a size of 100 μm or more. This operation is performed on 100 samples (total area: 1 m 2 ) to obtain the total number of foreign objects.

＜實施例1～3及比較例2、3＞ 自玻璃膜之卷狀捲繞體捲出玻璃膜，一面以搬送速度5 m/分鐘於一方向上進行搬送，一面進行玻璃膜表面之洗淨。洗淨後之玻璃膜暫時捲取成卷狀後，與上述比較例1同樣地，藉由光學顯微鏡觀察，求出每1 m2 之異物數量。<Examples 1 to 3 and Comparative Examples 2, 3> The glass film was rolled out from the roll of glass film, and the glass film surface was cleaned while being transported in one direction at a transport speed of 5 m/min. After the cleaned glass film was temporarily wound into a roll shape, it was observed with an optical microscope in the same manner as in Comparative Example 1, and the number of foreign matter per 1 m 2 was determined.

＜實施例1：毛刷洗淨＞ 藉由具備旋轉毛刷及真空清潔刷之網片清潔刷(伸興製造之「TURBO-SS」)進行玻璃膜表面之洗淨。運行條件如以下所示。 毛刷：尼龍製，長度20 mm，粗度75 μm 毛刷轉速：500 rpm(相對於玻璃膜搬送方向反向旋轉) 毛刷與玻璃膜之距離：1 mm 鼓風機運行條件：-3 kPa<Example 1: Brush cleaning> The surface of the glass film is cleaned with a mesh cleaning brush ("TURBO-SS" manufactured by Shenxing) with a rotating brush and a vacuum cleaning brush. The operating conditions are as follows. Brush: made of nylon, length 20 mm, thickness 75 μm Brush speed: 500 rpm (reverse rotation relative to the glass film conveying direction) The distance between the brush and the glass film: 1 mm Blower operating conditions: -3 kPa

＜實施例2：乾冰噴射洗淨＞ 於寬度方向(與搬送方向正交之方向)上藉由具備複數個噴嘴之乾冰噴射裝置(Air Water製造之「QuickSnow」)進行玻璃膜表面之洗淨。運行條件如以下所示。 乾冰粒徑：100 μm

Figure 02_image003
空氣壓力：0.4 MPa 噴嘴與玻璃膜之距離：20 cm<Example 2: Dry ice blasting cleaning> The surface of the glass film was cleaned by a dry ice blasting device ("QuickSnow" manufactured by Air Water) with a plurality of nozzles in the width direction (direction orthogonal to the conveying direction). The operating conditions are as follows. Dry ice particle size: 100 μm
Figure 02_image003
Air pressure: 0.4 MPa The distance between the nozzle and the glass film: 20 cm

＜實施例3：雙流體洗淨＞ 於寬度方向上藉由具備複數個雙流體噴嘴(Spraying Systems Japan製造)之雙流體洗淨裝置進行玻璃膜表面之洗淨。運行條件如以下所示。 液體：水 氣體：壓縮空氣 水壓：0.2 MPa 空氣壓：0.2 MPa 噴嘴與玻璃膜之距離：1 cm<Example 3: Two-fluid washing> The surface of the glass film was cleaned by a two-fluid cleaning device equipped with a plurality of two-fluid nozzles (manufactured by Spraying Systems Japan) in the width direction. The operating conditions are as follows. Liquid: water Gas: compressed air Water pressure: 0.2 MPa Air pressure: 0.2 MPa The distance between the nozzle and the glass film: 1 cm

＜比較例2：超音波洗淨＞ 使用超音波洗淨裝置(Branson製造之「8510J-MTH」)，於常溫之水中進行10分鐘洗淨。<Comparative example 2: Ultrasonic cleaning> Use an ultrasonic cleaning device ("8510J-MTH" manufactured by Branson) to wash in water at room temperature for 10 minutes.

＜比較例3：黏著輥＞ 將黏著輥(明和橡膠工業製造之「Betaron」)以層壓壓力0.2 MPa壓抵於玻璃膜之表面，進行玻璃膜表面之洗淨。<Comparative Example 3: Adhesive Roll> The adhesive roller (“Betaron” manufactured by Mingwa Rubber Industry) is pressed against the surface of the glass film with a lamination pressure of 0.2 MPa to clean the surface of the glass film.

＜製品良率之評價＞ 於將上述於玻璃膜貼合樹脂膜而成之光學積層體用於畫面尺寸15英吋(332 mm×187 mm)之顯示器之情形時，基於每1 m2 之異物數量算出面內不存在100 μm以上之異物而可作為正常品來應用之比率(＝製品良率)。將實施例1～3及比較例1～3之玻璃膜之異物數量、以及良率之計算結果示於表1。<Product yield evaluation> When the above-mentioned optical laminate formed by laminating a resin film on a glass film is used for a display with a screen size of 15 inches (332 mm×187 mm), based on foreign matter per 1 m 2 Calculate the ratio (=product yield) that can be used as a normal product without foreign matter above 100 μm in the surface. Table 1 shows the calculation results of the number of foreign matter and the yield of the glass films of Examples 1 to 3 and Comparative Examples 1 to 3.

[表1]    洗淨方法 附著異物數量(個/m2 ) 良率(%) 5 μm 100 μm以上 實施例1 毛刷 500 1 93 實施例2 噴射 375 1 93 實施例3 雙流體 300 0 100 比較例1 未洗淨 5548 72 0 比較例2 超音波 4287 36 0 比較例3 黏著輥 3465 44 0 [Table 1] Washing method Number of foreign matter attached (pieces/m 2 ) Yield rate (%) 5 μm Above 100 μm Example 1 brush 500 1 93 Example 2 injection 375 1 93 Example 3 Two-fluid 300 0 100 Comparative example 1 Unwashed 5548 72 0 Comparative example 2 Ultrasound 4287 36 0 Comparative example 3 Adhesive roller 3465 44 0

如表1所示，於未洗淨之玻璃膜(比較例1)附著有大量100 μm以上之異物，於15英吋中，由於100 μm以上之異物存在1個以上，故而製品良率之計算值成為0。於進行超音波洗淨之比較例2及藉由黏著輥進行附著異物之去除之比較例3中，與比較例1相比，附著異物數量減少。但是，異物之去除效果並不充分，15英吋之製品之良率之計算值係與參考例同樣為0。可知於實施例1～3中，由於100 μm以上之附著異物被適當地去除，故而於將包含100 μm以上之異物者作為不良品之情形時，亦可確保較高之良率。As shown in Table 1, a large amount of foreign matter of 100 μm or more adheres to the unwashed glass film (Comparative Example 1). In 15 inches, there are more than one foreign matter of 100 μm or more, so the product yield is calculated The value becomes 0. In Comparative Example 2 in which ultrasonic cleaning was performed and Comparative Example 3 in which adhered foreign matter was removed by an adhesive roller, the number of adhered foreign matter was reduced compared to Comparative Example 1. However, the removal effect of foreign matter is not sufficient, and the calculated value of the yield of the 15-inch product is 0 as in the reference example. It can be seen that in Examples 1 to 3, since the adhering foreign matter of 100 μm or more is appropriately removed, when the foreign matter of 100 μm or more is included as a defective product, a higher yield can be ensured.

[評價2：接著劑層表面之異物之形狀] 於未洗淨之玻璃膜上經由環氧系接著劑貼合厚度40 μm之丙烯酸系透明膜而獲得光學積層體。對於所獲得之光學積層體之利用目視觀察確認到異物存在之觀察部位1～5，按以下3個基準進行評價。 〇：能夠用於顯示器用途(目視下無法識別為缺陷) △：可以目視確認到缺陷，但能夠用作照明用 ×：顯示器用、照明用均無法使用[Evaluation 2: The shape of foreign matter on the surface of the adhesive layer] An acrylic transparent film with a thickness of 40 μm was bonded to the unwashed glass film via an epoxy-based adhesive to obtain an optical laminate. The observation sites 1 to 5 where the presence of foreign matter was confirmed by visual observation of the obtained optical laminate were evaluated based on the following three criteria. 〇: Can be used for display purposes (not recognized as a defect under visual inspection) △: Defects can be confirmed visually, but can be used for lighting ×: Cannot be used for display or lighting

將光學積層體浸漬於水中並進行加溫，於接著劑層與丙烯酸系透明膜之界面進行剝離而製作評價用試樣。針對上述觀察部位1～5之各者，求出異物之大小

Figure 02_image003
、及突出高度H，自
Figure 02_image003
及H算出傾斜角θ。突出部之高度H係自藉由相干性掃描式干涉計(Zygo NewView 7300)於物鏡：10倍、變焦透鏡20倍、測定範圍：0.35 mm×0.26 mm之條件下所測得之接著劑層表面之三維表面形狀算出。於解析時，藉由裝置配套之程式，以下述條件進行修正。 Removed：None 濾波器(Filter)：高通(High Pass) 濾波器類型(Filter Type)：高斯樣條(Gauss Spline) 低波長(Low wavelength)：300 μm 移動尖峰(Remove spikes)：on 尖峰高度(Spike Height)(xRMS)：2.5The optical laminate was immersed in water and heated, and peeled off at the interface between the adhesive layer and the acrylic transparent film to prepare an evaluation sample. Find the size of the foreign body for each of the observation sites 1 to 5 above
Figure 02_image003
, And the protrusion height H, since
Figure 02_image003
And H calculate the tilt angle θ. The height H of the protrusion is measured by the coherent scanning interferometer (Zygo NewView 7300) under the conditions of objective lens: 10x, zoom lens 20x, and measuring range: 0.35 mm×0.26 mm. The three-dimensional surface shape is calculated. When analyzing, use the program matched with the device to make corrections under the following conditions. Removed: None Filter: High Pass Filter Type: Gauss Spline Low wavelength: 300 μm Remove spikes: on Spike height (Spike) Height)(xRMS): 2.5

將觀察部位1～5之異物之尺寸、突出部之高度H及角度θ、以及利用目視之評價結果示於表2。再者，於觀察部位5中，異物舞設於接著劑層中，未確認到突出部。Table 2 shows the size of the foreign matter in the observation sites 1 to 5, the height H and the angle θ of the protrusion, and the visual evaluation results. In addition, in the observation site 5, foreign matter was placed in the adhesive layer, and no protrusion was confirmed.

[表2] 觀察部位

Figure 02_image003
(μm) H(μm) θ(°) 目視評價 1 72 8.3 13 × 2 190 5.3 3.2 △ 3 86 5.9 7.8 △ 4 83 6.1 8.4 △ 5 50 0 0 〇 [Table 2] Observation site
Figure 02_image003
(μm) H(μm) θ(°) Visual evaluation 1 72 8.3 13 × 2 190 5.3 3.2 △ 3 86 5.9 7.8 △ 4 83 6.1 8.4 △ 5 50 0 0 〇

於觀察部位1中，異物之尺寸

Figure 02_image003
小於觀察部位2～4，但於目視評價中，作為光學缺陷顯著。另一方面，於觀察部位5中，確認到異物之存在，但由於異物未自接著劑之表面突出，因此於光學積層體之目視觀察中未識別為光學缺陷。In observation area 1, the size of the foreign body
Figure 02_image003
It is smaller than the observation part 2 to 4, but in the visual evaluation, it is remarkable as an optical defect. On the other hand, in the observation part 5, the presence of foreign matter was confirmed, but since the foreign matter did not protrude from the surface of the adhesive, it was not recognized as an optical defect in the visual observation of the optical laminate.

自表2所示之結果可知，即便於設置於玻璃膜之表面之接著劑層中所存在之異物尺寸較小之情形時，於自接著劑層表面突出之高度較大且突出部之傾斜角度較大之情形時，亦容易作為光學缺陷被識別。反之，可知即便於存在異物之情形，於自接著劑層表面之突出較小(無突出)之情形時，亦難以作為光學缺陷被識別。From the results shown in Table 2, it can be seen that even when the size of the foreign matter in the adhesive layer provided on the surface of the glass film is small, the height of the protrusion from the surface of the adhesive layer is large and the inclination angle of the protrusion In larger cases, it is easy to be identified as an optical defect. Conversely, it can be seen that even in the presence of foreign matter, when the protrusion from the surface of the adhesive layer is small (no protrusion), it is difficult to be recognized as an optical defect.

10:玻璃膜 20:樹脂膜 29:凸部 30:偏光元件 50:接著劑層 80:黏著劑層 91:隔離件 92:表面保護膜 101:光學積層體 x:異物10: Glass film 20: Resin film 29: Convex 30: Polarizing element 50: Adhesive layer 80: Adhesive layer 91: spacer 92: Surface protective film 101: Optical laminate x: foreign body

圖1係表示光學積層體之積層構成例之剖視圖。 圖2係表示因接著劑層中之異物而形成於樹脂膜之表面之凸部之模式圖。 圖3係突出部之傾斜角θ之算出方法之說明圖。 圖4A係接著劑層中所包含之異物之光學顯微鏡照片，B係自接著劑層之表面突出之異物及其附近之三維表面形狀。Fig. 1 is a cross-sectional view showing an example of the laminated structure of the optical laminated body. Fig. 2 is a schematic view showing the convex portion formed on the surface of the resin film due to the foreign matter in the adhesive layer. Fig. 3 is an explanatory diagram of the method of calculating the inclination angle θ of the protrusion. Fig. 4A is an optical micrograph of the foreign matter contained in the adhesive layer, and B is the three-dimensional surface shape of the foreign matter protruding from the surface of the adhesive layer and its vicinity.

10:玻璃膜 10: Glass film

20:樹脂膜 20: Resin film

30:偏光元件 30: Polarizing element

50:接著劑層 50: Adhesive layer

80:黏著劑層 80: Adhesive layer

91:隔離件 91: spacer

92:表面保護膜 92: Surface protective film

101:光學積層體 101: Optical laminate

Claims (8)

一種光學積層體，其係積層厚度150 μm以下之具有可撓性之玻璃膜、與樹脂膜而成者，且 上述玻璃膜具有第一主面及第二主面， 於上述玻璃膜之第一主面上經由接著劑層貼合有上述樹脂膜， 上述接著劑層中之100 μm以上之異物之數量為10個/m2 以下。An optical laminate, which is formed by laminating a flexible glass film with a thickness of 150 μm or less and a resin film, and the glass film has a first main surface and a second main surface, and is positioned on the first surface of the glass film. The above-mentioned resin film is bonded to the main surface via an adhesive layer, and the number of foreign matter of 100 μm or more in the above-mentioned adhesive layer is 10 pieces/m 2 or less. 如請求項1之光學積層體，其中上述接著劑層中之5 μm以上且未達100 μm之異物之數量為1300個/m2 以下。The optical layered body of claim 1, wherein the number of foreign objects of 5 μm or more and less than 100 μm in the adhesive layer is 1,300 pieces/m 2 or less. 如請求項1之光學積層體，其中上述接著劑層中之100 μm以上之異物中，與接著劑層之折射率差超過0.02之異物之數量為5個/m2 以下。The optical layered body of claim 1, wherein the number of foreign matter of 100 μm or more in the adhesive layer whose refractive index difference with the adhesive layer exceeds 0.02 is 5 pieces/m 2 or less. 一種光學積層體，其係積層厚度150 μm以下之具有可撓性之玻璃膜、與樹脂膜而成者，且 上述玻璃膜具有第一主面及第二主面， 於上述玻璃膜之第一主面上經由接著劑層貼合有上述樹脂膜， 上述接著劑層之樹脂膜側表面之突出部高度為7 μm以上之異物的數量為10個/m2 以下。An optical laminate, which is formed by laminating a flexible glass film with a thickness of 150 μm or less and a resin film, and the glass film has a first main surface and a second main surface, and is positioned on the first surface of the glass film. The above-mentioned resin film is bonded to the main surface via an adhesive layer, and the number of foreign objects with a protrusion height of 7 μm or more on the resin film side surface of the adhesive layer is 10 pieces/m 2 or less. 一種光學積層體，其係積層厚度150 μm以下之具有可撓性之玻璃膜、與樹脂膜而成者，且 上述玻璃膜具有第一主面及第二主面， 於上述玻璃膜之第一主面上經由接著劑層貼合有上述樹脂膜， 上述接著劑層之樹脂膜側表面之突出部傾斜角為10°以上之異物的數量為10個/m2 以下。An optical laminate, which is formed by laminating a flexible glass film with a thickness of 150 μm or less and a resin film, and the glass film has a first main surface and a second main surface, and is positioned on the first surface of the glass film. The above-mentioned resin film is bonded to the main surface via an adhesive layer, and the number of foreign objects whose inclination angle of the protrusion on the resin film side surface of the above-mentioned adhesive layer is 10° or more is 10 pieces/m 2 or less. 一種光學積層體，其係積層厚度150 μm以下之具有可撓性之玻璃膜、及樹脂膜者， 上述玻璃膜具有第一主面及第二主面， 於上述玻璃膜之第一主面上經由接著劑層貼合有上述樹脂膜， 上述接著劑層之樹脂膜側表面之突出部高度為7 μm以上或傾斜角為10°以上之異物的數量為10個/m2 以下。An optical laminate, which is a laminate of a flexible glass film and a resin film with a thickness of 150 μm or less, the glass film having a first main surface and a second main surface, on the first main surface of the glass film The above-mentioned resin film is bonded via the adhesive layer, and the number of foreign objects whose protrusion height is 7 μm or more or the inclination angle is 10° or more on the resin film side surface of the adhesive layer is 10 pieces/m 2 or less. 如請求項1至6中任一項之光學積層體，其包含偏光元件作為上述樹脂膜。The optical laminate according to any one of claims 1 to 6, which includes a polarizing element as the above-mentioned resin film. 如請求項6之光學積層體，其中於上述玻璃膜之第一主面上經由上述接著劑層貼合有透明樹脂膜，於上述透明樹脂膜上貼合有偏光元件。The optical laminate according to claim 6, wherein a transparent resin film is bonded to the first main surface of the glass film via the adhesive layer, and a polarizing element is bonded to the transparent resin film.
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